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Period

Period is a child type of Date Group that represents the most general time interval that corresponds to a sequence of Single Period objects.
For example, a Period object may represent the time interval constructed by putting together in a consecutive manner a period of 1 month followed by a period of 3 days.

Due to the fact that the type Single Period is a
child type of Period, it is possible to treat a Single Period object as if it were a Period object.

Similarly, due to the fact that the type
Step is a child type of Single Period and hence also a child type of Period, it is possible to do the same with a Step object.
Therefore, simply entering the text %3M suffices to create a Period object that represents 3 months.
Similar simple entries are %3D for 3 calendar days, or %1B{US} for 1 business day wrt the US calendar, or %1B{US|MF} for 1 business day wrt the US calendar and the Modified Following date bump convention.

All available time unit letters are listed in
Time Unit
All available calendar codes are listed in
Calendar::Name
All available date bump conventions are listed in
DateBump::Name